Door spring and check



(No Model.) 2 Sheets$heet 1.

H. W. LARSSON. 000R SPRING AND GHEOK.

' No. 530,230. Patented Dec. 4, 1894.

1 ERS cc, Pnorou'ma, wnsmumml, n. c.

(No Model.) 2 sheets sheet 2 H. W. LARSSON. DOOR SPRING AND CHECK.

Patented Deb. 4 1894.

top and on the'other at the bottom.

STATES PAT ENT DOOR SPRING AND CHECK.

SPECIFICATION-V forming part of Letters Patent N 0. 530,230, dated December 4,1894.

Application filed July 27,1893. 'SerialNo. 481,615. (NomodeL) To all whOm, it ntay concern:

Be it known that I, HENRY W. LARSSON, a citizen of the United States of America, re siding in Springfield, Hampden county, Mas sachusetts, have invented new and useful Improvements in Door Springs and Checks, of which the following is a specification, reference being had to the accompanying drawings and letters of reference marked thereon.

In the drawings, like letters of reference indicating like parts, Figure 1 is a plan view of my improved device in the position occupied by it when the door is closed. Fig. 2 is a side elevation of one of the legs of the toggle lever detached. Fig. 3 is a like view of the other leg of theftoggle lever. Fig. at is a plan view of the lower portion of the leg shown in Fig. 3. Fig. 5 is a front elevation of my device showing the position occupied by its parts when the door is closed. Fig. 6 is a plan View showing the position of the parts when the door is open. Fig. 7 is a plan view of my device showi'ng the cylinder and toggle lever mounted on the door. Fig. 8 is a side elevation of the same, and Fig. 9 is a plan view with the door open.

In detail a indicates the door frame; I), the door; 0, the cylinder barrel; d cl, cylinder heads; 0, piston; f, piston-rod; 9, guide rod; h

and j, legs of toggle-lever; '5, traveler; 7c, pivot;

Z, spring; 771., connecting rod, and 0 brackets.

The construction and operation of my device are as follows:

Atoggle lever formed of the two yoke shaped pieces h and j united by a pivot is is provided with a springlone end of which spring engages one yoke and the opposite end the other yoke in such manner as to tend to maintain the toggle lever open with the legs in line with each other. The yokes are provided with a grooved or recessed segmental plate 15 to form a bearing for the end portions of the spring, the plate on one yoke being at the Each yoke with its projecting arm or arms forms one leg of the toggle lever and these are socured together as stated by a pivot 70. The

leg j is provided with two arms which arms are pivotally mounted in a bracket 0. which bracket is either mounted on the door casing or on the door as circumstances may direct. I prefer to mount the cylinder and toggle lever with bracket on the door frame casing, and mount the bracket '11 to which the connecting rod is attached on the door. If, however the casing will not readily permit of such arrangement then I may mount the cylinder, with toggle lever and bracket on the door and connecting rod bracket on the casing as shown in Figs. 7, 8, and 9, of the drawings. Each cylinder head is provided with a base portion made integral therewith through which screws pass to secure the sameto the door or casing, and the cylinder. head (1 is provided with a recess to receive one end of the rail 9. The bracket 0 is provided with a lug 0 made integral therewith in which is an opening to receive the other end of the rail g. The traveler is mounted upon and traverses the rail 9 and is provided with antifriction rolls which bear against the rail and overcome all friction between these parts.

One leg of the toggle lever is pivotally connected with the traveler and the end of the piston rod is secured to the traveler, so that the expansion of the toggle leverby the operation of the spring forces the traveler toward the cylinder, thus forcing the piston rod and piston into the cylinder, and compressing the airbelow the piston, thus checking the movement of the arm, and allowing it to move' only as the compressed air is allowed to escape thus preventing the rapid closing of the door.

In the arrangement illustrated in Figs. 1, 5 and 6 the connecting rod extends from the pivot of the toggle lever to a bracket mounted on the door, and as the door is opened the pivotal portion of the toggle is carried in a like direction causing the leg mounted in the fixed bracket 0 to turn in the bracket, and drawing the other leg in the same direction. As however the movement of the leg 72. is restricted to the movement allowed by the carrier 7; the two legs are carried toward each other, and the spring thereby compressed, and the piston rod and piston drawn outwardly.

When the door is released the spring operates to force the free ends of the legs of the toggle lever apart,and as they cannot sepa rate except as they assume the relative positions occupied prior to the opening of the door, the parts are forced to their first p0sition and the door thereby turned on its hinges and closed; and as the power of the spring is lessened as it expands, this relative positions of the legs of the toggle lever are constantly changing, and as they more nearly approach a position in line with each other the leverage is increased so that notwithstanding the fact that the spring power lessens, the leverage will increase to its greatest force at the time of latching the door; and as the check restrains undue rapidity of movement, the door will be forcibly but gradually closed.

Each half of the toggle lever is provided with an oifset at the pivotal part to bear against a corresponding lug or offset on the other, so that when the two legs lie nearly in line with each other, these parts will be in engagement and further movement in that direction be prevented.

The only diiference required when the cylinder and toggle are mounted on the door is that the form of bracket mounted on the lower face of the door casing should be changed a trifle, the stud to which the connecting rod is pivoted projecting at right angles from the bracket base instead of parallel therewith.

Having therefore described my invention, what I claim, and desire to secure by Letters Patent, is-

In a door check, the combination of a HENRY W. LARSSON.

Witnesses:

ALLEN WEBSTER, E. C. STICKNEY. 

